Lens module
There is provided a lens module including: a first lens having refractive power and having a shape in which an image-side surface is concave; a second lens having refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power; and a sixth lens having refractive power and having a point of inflection formed on an image-side surface thereof.
1. A lens module comprising:
a first lens having refractive power and having a shape in which an image-side surface is concave;
a second lens having refractive power;
a third lens having positive refractive power;
a fourth lens having positive refractive power and a concave object-side surface;
a fifth lens having negative refractive power; and
a sixth lens having refractive power and having a point of inflection formed on an image-side surface thereof.
2. The lens module of claim 1 , wherein the first lens has a shape in which an object-side surface thereof is convex.
3. The lens module of claim 1 , wherein the second lens has a shape in which an object-side surface thereof is convex.
4. The lens module of claim 1 , wherein the fifth lens has a shape in which an image-side surface thereof is convex.
5. The lens module of claim 1 , wherein the sixth lens has negative refractive power.
6. The lens module of claim 1 , wherein at least one of the first to sixth lenses is formed of plastic.
7. The lens module of claim 1 , wherein at least one of an object-side surface and an image-side surface of at least one of the first to sixth lenses is an aspherical surface.
8. The lens module of claim 1 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 1:
TTL/f< 1.3 [Conditional Equation 1]
where TTL indicates a distance [mm] from an object-side surface of the first lens to an image surface, and f indicates a focal length [mm] of the overall optical system.
9. The lens module of claim 1 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 2:
| V 2− V 3|<33 [Conditional Equation 2]
where V2 indicates the Abbe number of the second lens, and V3 indicates the Abbe number of the third lens.
10. The lens module of claim 1 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 3:
| Nd 4− Nd 5|<0.1 [Conditional Equation 3]
where Nd4 indicates a refractive index of the fourth lens, and Nd5 indicates a refractive index of the fifth lens.
11. The lens module of claim 1 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 4:
| f 3/ f|< 60 [Conditional Equation 4]
where f3 indicates a focal length [mm] of the third lens, and f indicates a focal length [mm] of the overall optical system.
12. The lens module of claim 1 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 5:
| r 9/ f 5|<0.2 [Conditional Equation 5]
where r9 indicates a radius of curvature [mm] of an object-side surface of the fifth lens, and f5 indicates a focal length [mm] of the fifth lens.
13. The lens module of claim 1 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 6:
|( r 5+ r 6)/( r 5− r 6)|<16 [Conditional Equation 6]
where r5 indicates a radius of curvature [mm] of an object-side surface of the third lens, and r6 indicates a radius of curvature [mm] of an image-side surface of the third lens.
14. The lens module of claim 1 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 7:
| r 3/ f 2|<2.6 [Conditional Equation 7]
where r3 indicates a radius of curvature [mm] of an object-side surface of the second lens, and f2 indicates a focal length [mm] of the second lens.
15. The lens module of claim 1 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 8:
f 3/ f 4>3.0 [Conditional Equation 8]
where f3 indicates a focal length [mm] of the third lens, and f4 indicates a focal length [mm] of the fourth lens.
16. The lens module of claim 1 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 9:
V 6− V 5>30 [Conditional Equation 9]
where V5 indicates the Abbe number of the fifth lens, and V6 indicates the Abbe number of the sixth lens.
17. A lens module comprising:
a first lens having positive refractive power and having a shape in which an image-side surface is concave;
a second lens having refractive power and having a shape in which an object-side surface is convex;
a third lens having positive refractive power;
a fourth lens having positive refractive power and a concave object-side surface;
a fifth lens having negative refractive power; and
a sixth lens having refractive power and having a point of inflection formed on an image-side surface thereof.
18. The lens module of claim 17 , wherein the first lens has a shape in which an object-side surface thereof is convex.
19. The lens module of claim 17 , wherein the second lens has negative refractive power.
20. The lens module of claim 17 , wherein the second lens has a shape in which an image-side surface thereof is concave.
21. The lens module of claim 17 , wherein the fifth lens has a shape in which an image-side surface thereof is convex.
22. The lens module of claim 17 , wherein the sixth lens has negative refractive power.
23. The lens module of claim 17 , wherein at least one of the first to sixth lenses is formed of plastic.
24. The lens module of claim 17 , wherein at least one of an object-side surface and an image-side surface of at least one of the first to sixth lenses is an aspherical surface.
25. The lens module of claim 17 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 1:
TTL/f< 1.3 [Conditional Equation 1]
where TTL indicates a distance [mm] from an object-side surface of the first lens to an image surface, and f indicates a focal length [mm] of the overall optical system.
26. The lens module of claim 17 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 2:
| V 2− V 3|<33 [Conditional Equation 2]
where V2 indicates the Abbe number of the second lens, and V3 indicates the Abbe number of the third lens.
27. The lens module of claim 17 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 3:
| Nd 4− Nd 5|<0.1 [Conditional Equation 3]
where Nd4 indicates a refractive index of the fourth lens, and Nd5 indicates a refractive index of the fifth lens.
28. The lens module of claim 17 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 4:
| f 3/ f|< 60 [Conditional Equation 4]
where f3 indicates a focal length [mm] of the third lens, and f indicates a focal length [mm] of the overall optical system.
29. The lens module of claim 17 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 5:
| r 9/ f 5|<0.2 [Conditional Equation 5]
where r9 indicates a radius of curvature [mm] of an object-side surface of the fifth lens, and f5 indicates a focal length [mm] of the fifth lens.
30. The lens module of claim 17 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 6:
|( r 5+ r 6)/( r 5− r 6)|<16 [Conditional Equation 6]
where r5 indicates a radius of curvature [mm] of an object-side surface of the third lens, and r6 indicates a radius of curvature [mm] of an image-side surface of the third lens.
31. The lens module of claim 17 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 7:
| r 3/ f 2|<2.6 [Conditional Equation 7]
where r3 indicates a radius of curvature [mm] of an object-side surface of the second lens, and f2 indicates a focal length [mm] of the second lens.
32. The lens module of claim 17 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 8:
f 3/ f 4>3.0 [Conditional Equation 8]
where f3 indicates a focal length [mm] of the third lens, and f4 indicates a focal length [mm] of the fourth lens.
33. The lens module of claim 17 , wherein an optical system including the first to sixth lenses satisfies the following Conditional Equation 9:
V 6− V 5>30 [Conditional Equation 9]
where V5 indicates the Abbe number of the fifth lens, and V6 indicates the Abbe number of the sixth lens.